Fire-detector



-A. HUDUN AND P. WARD..

' FIRE DETECTOR. APFL'ICATION FILED JULY I, l9l9.

Patenteu Nov. 15, 1921 H0 HUDDN Pg; 5.

Ca I UNITED STATES PATENT OFFICE.

ARTHUR HUDON AND PERCY \VILLIAM WARD, OF OTTAWA, ONTARIO, CANADA, ASSIGNORS TO SPARIDON ELECTRICAL PRODUCTS COMPANY, LIMITED, OF

OTTAWA, CANADA, A CORPORATION.

FIRE-DETECTOR.

Application filed July 1,

T 0 all whom it may concern:

Be it known that we, ARTHUR HUDON and PERCY TVILLIAM VARD, subjects of the King of Great Britain, and residents of the city of Ottawa, in the Province of Ontario, Dominion of Canada, have invented certain new and useful Improvements in Fire-Detectors, of which the following is a specification.

This invention relates to improvements in fire directors of the thermostat type in which a circuit is completed through the expansion of a thermostatic member, and the objects of the invention are to generally improve and simplify the construction of the device to better adapt the various parts to perform the functions required of them.

More specific objects are to provide improvements in the means for adjusting the contact point to cause the circuit to be completed at different points on the temperature scale, and the invention consists essentially 7 of the improved construction hereinafter described in detail in the accompanying specification and drawings.

In the drawings:

Figure 1 is a perspective view of the'device with the cover removed.

Fig. 2 is a Plan view.

Fig. 3 is a cross sectional view.

Fig. 4 is a plan view of the bottom.

In the drawings like characters of reference indicate corresponding parts in all the figures.

Referring to the drawings, A indicates the base constructed of wood or similar insulating or insulated material. 10 represents a plate mounted on the base and carrying a thermostatic element B. This thermostatic element may be of any usual type adapted to expand when the temperature is increased, such element usually consisting of a thermostatic couple of two metals, one of which ex pands to a greater extent than the other. One end of the element is fixed to the plate 10 by suitable means such as a block 11 secured to the element and also to the base.

The free end of the thermostatic element is engaged by the free end of a lever C which extends through the end and has sliding contact therewith, the end of the lever being hook-shaped whereby the end of the thermostatic element is prevented from slipping off the same. The lever is centrally pivoted and Specification of Letters Patent.

Patented Nov. 15, 1921.

1919. Serial No. 308,009.

the means to accomplish this, in the embodi ment illustrated, comprise a bushing or sleeve 12 which extends through and is journaled in the plate 10. The end 13 on the lever is turned through the sleeve or bushing 12. Bmdlng posts 141- and 15 are provided on the base, the binding post 14 being connected to the pin D, the pin being insulated by suitable washers from the plate 10. The binding post 15 is connected to a terminal 18 on the plate 10.

The block 11 is conveniently formed of insulating material whereby the thermostatic element will remain out of contact with the plate 10, and the lever C is adapted, when the thermostatic element is expanded a given amount, to make contact with the contact element or pin D which extends through the plate 10 and is adapted to engage with one of a series of holes 16 in the plate, the said holes being arranged in a row or on a graduated arc, and having a scale associated therewith whereby the pin may be adjusted for different temperatures, the scale 17 indicating the particular temperature at which the circuit will be completed when the pin is in any given hole.

Any suitable form of cover E may be provided to inclose the working parts.

It will be seen that as the temperature in creases the thermostatic element will be expanded and the lever C will contact with the pin D completing the electrical circuit and causing an alarm to be given in the usual way, the device being used in connection with any desirable form of alarm system in which the alarm is given by the completion of an electrical circuit.

As many changes could be made in the above construction, and many apparently widely different embodiments of our invention, within the scope of the claims, constructed without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specification and drawings shall be interpreted as illustrative and not in a limiting sense.

What we claim as our invention is:

A detector of the character described, comprising a base, a plate on the base, an insulated block fixed to the base, a coiled thermostatic element mounted on the plate, having an end fastened to the block, and a movable end, a lever centrally pivoted on the plate and having a free end connected to the movable end of the thermostatic element the lever being electrically connected to the plate, the plate being provided with a plu- 5 l'ality of orifices, a contact pin designed to engage with any of the orifices and insulated from the plate so as to vary the temperature under which the lever will contact, a pair of 7 posts, one of the posts being electrically con- 10 nected to the contact pin and the other post 1 being electrically connected to the plate, as and for the purpose specified.

In Witness whereof We have herenuto set our hands in the presence of two Witnesses.

ARTHUR HUDON. PERCY WILLIAM WARD.

itnesses RUssEL B. SMART, P. M. GARREW. 

